View passage for furnaces



June 18, 1929. v s m 1,717,636

VIEW PASSAGE FOR FURNACES Filed Oct. 31, 1924 2 Sheets-Sheet l WWWHfiWWWWWWFW 9 W'IEW 5:1

R P Vastine (9? Patented June; 18, 1929.

D STATES PATENT oF ics. 1 3

RAY r. vesrmn. or CHICAGO, ILLINOIS, ASSIGNOR rro GEORGE M. FVASTINE, OF a CHICAGO, ILLINOIS. I s

VIEW PASSAGE FOR FURNACES.

Application filed October 31, 1924. SeriaINO. 746,982.

This invention relates to a device for permitting the surface of the fire in a furnace to be viewed from outside the same without necessitating the opening of any doors or closures. s

In furnaces of various types it is particularly desirable to view the fire on the grate from time to time in order to ascertain by its appearance whether or not there are any dull spots clinkers etc, or whether or not itis burning properly.

Previous to this time no device view without necessitating the opening of a door or a peep hole with the resulting cold draft on the fire and loss in efiicieney or in the case of forced draft furnaces theresulting flare of heat out through the opening which represents a material heat loss and in addition may cause serious injury or discomfort to individuals near the openings. Or dinarily no transparent material such as glass will stand the high heat of the furnace in order to permit its use in a device of this kind so that heretofore this has been'th chief obstacle to such a device.

It is therefore the object of this invention to provide a device of this kind in which the heat is so reduced near the exterior of the opening permitting such aview that glass or similar substance may be used in said opening for the closure thereof.

More broadly it is the object of this invention to provide a device which will permit a view to be hadof the entire surface'of the fire on the grate without opening any passage to the furnace.

It is further the object of this invention to provide a passage in the side of the furnace having a flare in its outer end for permitting a maximum view of thegrate and for diminishingthe intensity of heat radia tion to the outer end of said passage and to provide an air eirculation'around said passage to assist in reducing the heat therein.

It is also an important object of this invention to provide a passage in the side of the furnace for viewing the fire in which the intensity of heat radiation therethrough is reduced gradually towards the outer end thereof by the use of transparent screens situated at intervals across said passage.

It is also an important object of this in vention to provide a view passageto the furnace in which the heat is so reduced in has been found practicable which will permit such a.

the outer end of said passage as to permit the use of a transparent substance such as glass to completely closethe outer end. It further an object of this invention to provide a passage of this kind in which glass or similar material is used to close the outer end thereof.

Other and further important objects of this invention will be apparent from the disclosures in the specification and'the accompanying drawings.

This invention (in a preferred'form) is illustrated in the drawings andhereinafter more fully-described.

On the drawings? Figure 1 isa direct front view of a device embodying principles of the. present invention. i

Figure 2 is a fragmentary central vertical sectional view showing the device mount ed in the wall of a combustion chamber or the like. i i

. Figure 3 is a reduced ure 2 but showing the device in elevation.

Figure 4; is a plan sectional view ofthe 7 device taken substantially along line IV' IV of Figure 3. f Figure 5 is a side view, of the device'in a horizontalposition showing the outer casing in central vertical section; and the inner casing in elevation.

Figure (5 is a vertical sectional view taken substantially along'the line VI-+VI of Fig ure 5. i i Z As shown on the drawings:

, Numeral 1 represents the side of the fur-' nace which in this case is a brick wall. It will be noted that the wall has an inclined aperture therethrough for receiving a ribbed casing 2. Thecasing 2 has a pluralityof longitudinal ribs thereon for resisting the conductivity of heat from the wall to said casing. As shown by Figure 4- thecasing 2 has a wide longitudinal flare at its outer end. This flare both reduces the intensity of the radiation of heat from the furnace to the outer side of the passage within the casing 2 and also increases the view obtainable from said outer side. Secured to the'casing 2are securing members 3 for securing the casing to the wall 1. Enclosed within the casing 2 is an inner casing 4 which is flared in a manner similar to" the outer casing 2.

view similar to FiglVithin the inner casing 4. which forms a view passage to thefurnace are a plurality v the ribs thereon.

of screens or grids 5 situated across the passage and spaoedat intervals throughout the length thereof. The screens 5 are preferably of cast iron of a mesh which is ofincreasing fineness toward the outer end of the passage to efiectually minimize the ra- Figure 5) in said air chamber provide a tor-1 tuous passage for-the air circulating therein which increases the thermal conduction through the walls of the casing, thereby diminishing the thermal radiation outwardly. Hinged to thefouter casing 2 at the outer end thereof isa'franie 9 having ri idly secured thereto outer and inner supporting members 10 and 11 for outer and inner panes 12 and 13; A circulation of air is provided between said panes by means of aplurality of holes lt therebetween in the lowerside of the frame 9 and an aperture 15 in the inner supporting memberll. By using a plurality of pane sections as shown in Figures 1 and 4 to make up the panes 12 and 13 cracking of the pane which might happen in using a single 'largepiece is prevented.

In the use of this device it will be seen thatxa, clear view of the surface of the fire is obtainable at all times whereas it has previously been necessary to open the furnace door or a peep hole, necessitating a material loss in efliciency as well asexposure to a flareback- This device is also adapted to be usedin oil burning furnaces where it is necessary to observe the burner frequently to determine whether a proper efiicient combustion is being obtained. ,In oil burning furnaces which always operate under forced draft the danger due to fiareback is very great especially when not operating under ward flare of the passage. The heat of condu'ctivity is decreased by the tortuous air passage and circulation therethrough be-V tween-the inner casing-4 and the outer casing 2. This heat is further decreased by the air surrounding the outer casing 2 between The air circulation be tween the two transparent panes 12 and 13 further decreases the temperature thereof,

departing from the principlesof this inven- 1 tion and I therefore do not purpose limiting the patent granted Qhereon, otherwise than necessitated by the prior art. r I claim as my-invention-r '1. In a device of the class described, a tubular casing, a plurality of graduated screens across the interior of said casing, 'said screens being progressively graduated with respect to their areas, and atransparent member closing the outer end of said casing; I v

2. In a device of the class described, a casing, a second casing within said first mentioned casing forming an air chamber therebetweeii, said air chamber being closed at the inner endof said casings, and ribs on the exterior of one of said casings.

3.'In a device of the class described, a

tubular casing, a plurality of screens across casing, said casing: having an outward flare toward the-exterior thereof.

I 4. The combination with a combustion chamber having an opening therein, a plurality of spaced transparent observation closures for said opening in constant exposure to the thermal radiation from said combustion space and means for insuring against destruction of said closures due to the constant thermal exposure thereof, said means including a plurality of grids 'positionediin SZLlCl: openingand graduated with respect to their planar areas.

The combination-with a combustion chamber having anopeningtherein, a phi rality of spaced transparent observation closures for, said opening in constant. exposure to the thermal radiation'from said combustion space, and means for insuring against destruction of said closures due to the constant thermal exposure thereof, said means including a plurality of spaced and apertured gridsin said casing, each of said grids 1 except one having larger apertures than the grid adjacent one side thereof to enhance the vision through said openin 6. The ;-combination with a combustion of hinged transparent closures for said opening, and means for diminishing thethermal radiation to said closures, said means includchaniber having. an openingthereima pair ing means permitting the passage of air be-' tween said closures, and a plurality of screens transversely disposed within said opening, the 'meshes of said screens being'of increasing fineness toward said closures- 7. In a furnacefire observer, a casing, a second casing therein, staggered webs between said casings providing a circuitous air passage therebetween, said passage "being closed at the inner end of said" observer.

8. In a 'deviceof the class described, an

outer casing having longitudinal ribs thereon, an inner casing, staggered Webs between said casings providing'a tortuous air passage therebetween, and apertured plates extending across said inner casing.

9. A furnace fire observer comprising a casing, a transparent closure associated with the outer end of said casing, and a plurality of plates extendingacross said casing, said plates having graduated apertures therein, each rearwardly disposed plate having larger apertures than its adjacent forwardly disposed plate. o

10. A furnace fire observer comprising an inwardly converging casing, a transparent closure for said casing, and a plurality of transverse plates graduated with respect to their planar areas in said casing and having apertures therein, said apertures being sized in inverse proportion to the area of said plates.

11. In a device of the class described, an inwardly converging casing, a pair of hinged transparent closures for the outer end of said casing, and means to protect said closures -from exposure to high temperature, said means comprising aplurality of transversely disposed apertured grids positioned in said casing, said grids being progressively graduated with respect to their planar areas, the apertures in said grids being sized in inverse proportion to the areas of said grids, the smaller of said grids being the innermost and having the largest apertures therein. i

12. In a device of the class described, an outer casing, an inner casing spaced from said outer casing to provide an air passage therebetiveen, said passage being closed .at i

the inner end of said casings, said outer casing having an entrance to and exit from 0 said passage adjacent its outer end.

13. In combination, a combustion chamber enclosure having an aperture therethrough, a casing partially Within and spaced from the walls of said aperture, a closure for said casing, there being means for admitting air through said aperture to increase the thermal conduction through said casing, and said casing having means for admitting air through the interior of said casing to diminish the thermal radiation from said combustion chamber.

14. In a device ofthe class described, a"

RAY P. VASTINE. 

